At least eight people were injured Friday morning when a tractor-trailer, box truck and bus collided in Sumner, East Pierce fire officials said.
The collision took place about 6 a.m. at Thompson Street and Traffic Avenue when a box truck T-boned a semi.
It was not immediately clear how the bus was involved in the crash.
Crews worked to clean up a diesel fuel spill and tow the wreckage from the area.
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Thompson Street was closed at Mount Circle and Traffic Avenue had reduced lanes.
Traffic at the nearby Sounder Station also was affected.